How to Fix the 'Invalid Parameter Number' Error in MySQL Multiple INSERT Queries?

Troubleshooting "Invalid Parameter Number" Error in Multiple Insert Query

While preparing a multiple insert query, you may encounter the following error:

SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Problem Analysis:

This error occurs when the number of elements in the $values and $matches arrays do not match. The insert statement expects a specific number of parameters based on the number of elements in $values, but the data provided in $matches does not align with this expectation.

Solution:

To resolve this issue, ensure that both the $values and $matches arrays have the same number of elements. Typically, this involves initializing the $values array before the loop to ensure it doesn't contain any pre-existing values.

Additionally, the hash column in the database table should have a unique index.

Refactored Code:

$matches = array('1');
$count = count($matches);
$values = [];

for ($i = 0; $i < $count; ++$i) {
    $values[] = '(?)';
}

$sql = "INSERT INTO hashes (hash) VALUES " . implode(', ', $values) . " ON DUPLICATE KEY UPDATE hash=values(hash)";
$stmt = $dbh->prepare($sql);
$data = $stmt->execute($matches);

By adhering to these guidelines, you can avoid the "Invalid parameter number" error and successfully execute your multiple insert query.

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